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Sometimes that can happen if the mobile pages are indexed on their own. In general, one solution to that could be to use the rel=canonical on the mobile pages, pointing to the desktop versions. When mobile users access the desktop pages, you could redirect them to the appropriate mobile version.
Is there a way in the mobile sitemap file, that I can say that these pages are only for mobile version for the searchbot
and likewise is there a tag that can be used in every mobile page stating these pages are for mobile users and not desktop.